Finding the Fourth Proportional to 1,016.39, 1,402.40 and 617.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.39 : 1,402.40 = 617.96 : x
2. Step 2: Convert to fraction form
   1,016.39/1,402.40 = 617.96/x
3. Step 3: Cross multiply
   1,016.39x = 1,402.40 × 617.96
4. Step 4: Simplify right side
   1,016.39x = 866,632.15
5. Step 5: Solve for x
   x = 866,632.15/1,016.39
6. Step 6: Final answer
   x = 852.66